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when trying to sign in to a particular web site I get the message "Server Error in '/ILSWeb' Application". Message next says "Runtime Error..an application error occurred on the server". Using iMac OS 10.15.6.

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I don't know how to determine if the error is in my computer settings or on the web site I'm trying to access. This particular site does not use Safari on mac OS, only Firefox, and I have not had this problem before the last update to Firefox, now running version 97.0.1. Would appreciate some direction as to where to start to fix this issue. Have not had this error message with any other web sites so far.

I don't know how to determine if the error is in my computer settings or on the web site I'm trying to access. This particular site does not use Safari on mac OS, only Firefox, and I have not had this problem before the last update to Firefox, now running version 97.0.1. Would appreciate some direction as to where to start to fix this issue. Have not had this error message with any other web sites so far.

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This is a server error, but can be caused by the data that is send via the HTTP request headers to the server.

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.